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Finding the Fourth Proportional to 1,857.20, 2,786.98 and 687.08

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Solution

The fourth proportional to 1,857.20, 2,786.98 and 687.08 is: 1,031.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,857.20 : 2,786.98 = 687.08 : x
  2. Step 2: Convert to fraction form
    1,857.20/2,786.98 = 687.08/x
  3. Step 3: Cross multiply
    1,857.20x = 2,786.98 × 687.08
  4. Step 4: Simplify right side
    1,857.20x = 1,914,886.69
  5. Step 5: Solve for x
    x = 1,914,886.69/1,857.20
  6. Step 6: Final answer
    x = 1,031.06

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.